alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING TA450 User-Agent Observed"; flow:established,to_server; http.user_agent; bsize:11; content:"application"; threshold:type limit,count 1,seconds 300,track by_src; classtype:misc-activity; sid:2067857; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_02_17, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Informational, tag TA450, updated_at 2026_02_20, former_sid 2866182; target:src_ip;)